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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6b8b28b33d340646b7e158d57e38349bcd90c3b4cfff848a76ed148481d38a' 
  AND token = 'n8x57C19NZRkXP3XTd0VacWMXOznO0TJiDwSybegIxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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