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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6901383786dcb97268506d6deaf18e5d8c4e17a684b9a3b66cdad524dd7a9c5' 
  AND token = 'qIek7vVxwCCwWRW+vBjPwF3AS6pwko3nSKlsu4t/zSo=' 
  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"
    }
  }
}