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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a18aff664e292ec56c0fe8c8e5fa94d7aa2cb730b13adf98aa2a0069f8507e' 
  AND token = 'v5v4XQtFAdQZZKAN7akjO9ymOoWH0gUhJ9mwLDJ9eHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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