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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ae1e7dc9655711e9f6bced7245bc9826b8aa15124b0b7f256ba78e0a38d558' 
  AND token = 'AFcqrU8jpYjEhXUeLL3KzQ7uARUF0VoSpkQoQj/qWoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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