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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c583f4c796d018c18012c4c5fc6786978593c80ab7da9855decd22a64baec9' 
  AND token = '2S/AfAo+hhX3d+he5RCq1KPcpOU/JRHI0WTRaethBp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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