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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934e268ee6a1ab99885c838174b6763a5382e6570a603c480139ba648d2db13e' 
  AND token = 'dJJSNP8f0IsG07wByDgCYY3eE1VsGHHeVdPabTuOjQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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