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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee80ece064f839d83890f0cd3627b687c496832961143e3e1b1283e9b1bd6347' 
  AND token = 'Lo+D9dITeathDenuOlIOfGwj/rQK6ir6h3TVq5nMHB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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