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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fe3b27d5838dbf0654f28ab5b2fc21b2d9705c170ef50d8ed86e5c2f103015' 
  AND token = 'LFX30nOzrGqwO/ia4Xo3sc85CxBoEU8ZF3XgJ5hXLn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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