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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b2ae7c8ef70f2059a0b119dd4de58a0ebd5a2a2e749dd107b44a9551f2223f' 
  AND token = 'ju+rrVJnlCDiVJ4n5wm5rIonxgXw+5kFEmG6qxw3JUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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