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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517c7bd51e48e59b7cbcdd21d83e76ff1234f484a0cb489e12b43c26afb116b6' 
  AND token = 'fyFhWe3Tl7sJhA7u6Bsn7oMq6PV32d0EeZRWDFLR4z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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