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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded7dd4b59d2eb95dfa2f244b42960c742cab292e20f10fc8e8359bb5259163c' 
  AND token = 'Bx7Uyx/VjF9w7FYOxCdB9n9PBbhkHK1bn4kg0Xjla+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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