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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76145cf8fe6d99cb2de1b0fd49b33f1a56df9d05a48cbbde00a1d9453db7c6f2' 
  AND token = 'wudapbAhqLqbhGlYzbM/3W9c5LHm9yCc4gg2kxztD0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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