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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd313c7c006de88196b8e4a24bc79a1d57e7a709194e441d9ff65ecf057106577' 
  AND token = 'mJayuH1MVk88plRy8dbImUkMBymNG3rE0BV79g+/cPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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