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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ed873ac43870d2410554a09e20b3ad25bfc5b91bae662f1efc896c6b694869' 
  AND token = 'ASuuBFF5x3Ocj1lfahua302yXPAKagdi1msCFikmf4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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