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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1a8172e673a467fd43bdbc831010ad88b8b18b5174f25e6c0e54d4bfb11470' 
  AND token = 'eoG7w3/4WkC35CBpsaob/MppQM5XHS5xge7OYy0S60E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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