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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42090e9e909ba0435a66cfd66705ae6cedca2e3c8fae8d2537a639e2324bd6e3' 
  AND token = 'OXjL3O7Gchlse+5RUNPE0D4+7CX6I3Te1+MrGq7lstk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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