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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6da0833f4ba436cb18606c9007dd6b532cf76f02fb49a1003694f3e4e0f44a' 
  AND token = 'MHNx+Q8AHyQ33j1EhFjGbHr4GKchecPR8iOzuD3yunc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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