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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35dc544ef70d4d92b1c3d269db1a5df5a1e92e7c4f6e5555e085f1fc1fefd46b' 
  AND token = 'l3ox4P21YqFxo1dsFMuGVnx8EvItwfJo65tvNVv8oMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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