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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fecaa058e89fa411377b95469d1a16607436cf2ab22d41960e5d12ce82aa28e' 
  AND token = 'LLBAz8Xx75vr0XI/XvjkyEVUM05tLqw8HkOuA6BeEYA=' 
  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"
    }
  }
}