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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513986362bf9c8f746f72110f96e2503f5a5954731edcd35a9268e0f8703654f' 
  AND token = 'AsTK1tcZJf7u3xKWFt1JyJ8bPg07TGdNR/hntAhKmW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}