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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a514fc5118046e716b7820a4a1eb4ceadbb0bb308b384527d96c99a3b40b818' 
  AND token = 'yib7D4xulgmwOW2tk7PrSm5KGkFxxNpPtgXtvRMT2r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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