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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c96b7b43355a1142d76ab03ae00adbc28b9425ea4f8386b75a0d26292a25ff' 
  AND token = '4CT/OKUnq8w/9cmWDZ/drcxv/EHosPGiOZXS5B8ZK48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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