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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed69e89b9879cf47974297699b9e2015f168997906da2dfcf36db9746d66728' 
  AND token = '/zhIXFswgHyCou6j8S/aSiInNllq1PpMu5CmJ0/2wvQ=' 
  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"
    }
  }
}