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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b030ba9bec9655d319ede3e7d4c9631fc396ca54ae44046707905e9f3ee10f' 
  AND token = '4vmcoLnHmvOD+PNGmAYKonXgSxM3CvKMtRVgyt82e4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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