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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c243a98c4337964cdf478959c841dafe3af8d662ec7bb46e8a0652b94bfacc' 
  AND token = 'o4mZX+zQj+7oGXraeDldy1pAxH/753+2djeZv5B6RcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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