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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499637e72c0929a2298d9e18973ba800cf31590a20bc403748f2140462b77d27' 
  AND token = '6+Ps9jW8dByGSL2gwB4X96HLOtRbLv6dq6D7ikYBkiw=' 
  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"
    }
  }
}