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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ac9460c3cbe21d860d0988c51436b43b689486a6a257f1a06e82168015c7c1' 
  AND token = 'XbYfCncOvesOBozB9AOKYG8Go6xKV007Vjx8eFrIZ1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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