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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073ea85972bd743e9568e5f4b014838e41b6638c233e013c43621ce50d62715e' 
  AND token = 'aoyy/xVMSgPrg9g6ekHFjGDStRSxa+6Y7Qih21mSDFM=' 
  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"
    }
  }
}