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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e265d6c49f9cf473ae901735794d45f59eb8d05f919930400e8e9285412c8ab' 
  AND token = 'eSuknrfrS1/bMfHxpUZw7gRCqdoPFkQ8vi+EycOL1Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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