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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed9692342e5d1fa5cca3e9638b1eb7503e188f0e423eb191c373b06b9dda057' 
  AND token = '/PIusniihY9qHpWIjNWbeAJ5NMJb4rYqItCM63bjUio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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