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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15f57293fdc5be5756066706911a34a3da8859161dc47a0a9b31788cde0e4d9' 
  AND token = 'nV30wwy+jgBEo8TiOkOEZca5+LZ5k8NCMIAdsUGfjuQ=' 
  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"
    }
  }
}