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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5160c5da5ac84af1f2cbb282c1dfb0ac838f80f8598f2fd6368adc9f4954aaa' 
  AND token = 'UzHN9WSJnnn8zXWHKf1xbnp5gAvo++a86YZ5OB/K8wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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