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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5506f6a84619357b0eb152e32d8e115e474cd6f0c24ea7d2594e15099adcda' 
  AND token = '+g8Txw19F8hlK7V8hcm8XERQjv+RDQGoqwcsTfZeNik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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