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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7d0a4656b1dc9116dd3791f3dd91160ea3421d2773538d4b8ad85ab6fce98b' 
  AND token = 'uxnweG4vim7P7qs31eyFYGXj7cVmmHgjEPoa80ZjHNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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