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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812765492b341525c25d1a6b771808b12d109fc57fca82cc9359c441210139b2' 
  AND token = '6iz3nlXEJZGonhqrVm63fzhAfcZ4QJo/5hbjK402FP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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