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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc4d70db7cda3819dbea6818340de7b98ddbd571b62a6449f0c43055c85ee07' 
  AND token = '37HjFWoZywcQ09Wzx6bcoijWkRexL2MlaI48SxK+p9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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