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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79e1d1b819eb527f3b367880d6029473b1d3e3c63105770a3ccc31ebca74ac3' 
  AND token = '5MC/2amJV4zNMyCCGz8RDQ6ut9aEt5VZhUm+W0R5I1o=' 
  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"
    }
  }
}