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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9956b8129a384e1c81f5fe7cf86732636053e9f023baafe6535288bee9cfb1' 
  AND token = 'UB3EJnyJ5V/4/EzmvWPhRqmF6H3TjgiHZ953NozkzcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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