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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8a70c6603e5784c107b8f580a79612ebc695023192efdd478d6f8b35665b77' 
  AND token = '807avAe+1kULUn7Iw8xmvJZVO9m32LP4pPJhvL7HPqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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