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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340b674a1611daa4eb485a820040070d0deda160ea952d77c0be036586361765' 
  AND token = 'o6Baapqe6s7rpeS3TPYbaeUupjCvbI/Mz2Yua90XW1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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