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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b6fe192ce50c85ef3c1f77c78f9b8e57c5c4d7fa27a5c93d8e2efdfe6a9036' 
  AND token = 'iYbRm9nOft+kanVq7BMJ+52qEJ7eEgtf6gcDZnVQO9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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