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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5cc23bd129da001a1a74215e6ed92004cb17bd5ffed9a6b372339c26a49c767' 
  AND token = 'dVpJP+ZIOmwk9eIa+10+5c9jClhCZoQpgr77xPs97uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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