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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b71bfe9f0057f2cc331684814e9da2ad96defa56679bea6e462ca9276952d2a' 
  AND token = 'Pm0mtlBsaXIpF1ksic3FMgxEq10gy8Sy0xRIBGVRQEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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