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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b522f341d2ddd54b0121ccaa178d393d96ec7b647f446505947b63bfb38b469' 
  AND token = '9eW107xTd5vYungGAr5lxx6XpM1GbpbKzTgRChibFec=' 
  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"
    }
  }
}