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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51059bd5129150b1640153bb8799e1907086d04c34626a28d262b3728f9c2dc' 
  AND token = 'EqO26oTSojopPSZff9Oo6bDU4mXTeEfr2zv4oV03g08=' 
  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"
    }
  }
}