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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a990480855333f6bed902d34d57998d97adf83d5cd89ee932aff5edd363f72d0' 
  AND token = 'OxJTZVNuL87FzUJSJGZd4ZhdnCHZr2UF/0qgykgZYSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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