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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033a07302943e4bd5b3b8692d5d26044d2fdc227f68503224d44daa262404728' 
  AND token = 'EsowRIjLtO45rE/960yXZe+oR8lEOUn4EfhFgtRSV+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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