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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ae80cea1d31cfaa1fac1056f85441b3b4e784c3d3df27e7dd3b25dceced69c' 
  AND token = 'lrV6DkSaS1rZtKjXsjfF3m+waNAwle6qmSMo8EFY1Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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