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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6c9a846abc480ba32752af9f925329018f2b3820939f8f8820d3fd2af60e2d' 
  AND token = 'UqL4aZBSXmYYyhea5rm99zQLTAeLB62bDQlw9zXXtUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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