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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61cb6ff5e8a2385f5b67e1adf71b6289a5cf38f6255960b1c92e3e189570f61a' 
  AND token = 'F2QK8b8VyUKVRKgLFIxD9HOhRZ5fTHMJBjohtcQe7+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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