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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3268fc05c6e64f62c2b6892a0e2d00e7f1d28d8a63eca2034f8fc841cd5003c8' 
  AND token = 'lUtwu6lhzjhWCyE3VjX8D+QcZhSWsPW0bD2w0zqz2Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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