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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6ddc6b23a563f453402575d84e70c38d8c20e9eb2982ce5c241c11f6506456' 
  AND token = 'YzdgOa6X83860RxluhrbbCVDXngyIqzjULBdje7W8O0=' 
  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"
    }
  }
}