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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69f4972267a984f0be39e8df40aa1444ef7ccbdc1c07092f363aa0460e3a59a' 
  AND token = 'CUyiSNXkn+niB1IiRPBaA5tPtAvr0zj64137ZIBrbvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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