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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a409566bc4011fe261f0ec92230c61f60cc7baf785f9b181eb22b5d2804219dc' 
  AND token = '9fM9izA6Jflhqzu1fmJT+TusRBiT9FNebAxLLiBtqZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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