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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f541bf7c083ed2ef3a9b27ad8b24b2b882edd672f9a60a2681121455b2ff5d' 
  AND token = 'DaD9DnsRmORLP9/Zz8674yD6mzfrjADuPJ/gVSrmbpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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